Preheat your waffle iron and grease it with butter. To a bowl, add 1 egg and mozzarella cheese, Whisk to combine.
Step 2
Pour ½ the mixture into each slot and close the waffle iron. Cook for 2-3 minutes until golden. Remove and transfer them to a plate.
Step 3
Place a pan over medium heat and add the bacon slices. Cook until crispy. Transfer to a plate lined with kitchen paper.
Step 4
To assemble, place 1 chaffle on a plate and lay one lettuce leaf. Spread the mayonnaise and place the tomato slices on top. Add the bacon.
Step 5
Finish with the second lettuce leaf and chaffle. You can slice the sandwich in half for easy handling. Serve immediately with your choice of condiments.